Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05c3c625d7951c5…

MALICIOUS

PDF

69.6 KB Created: 2021-03-01 21:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 536e15aa89741902a96f56afaf4a710c SHA-1: 80779ee858da241fa728d07fba8c4bf7c1a853c3 SHA-256: e05c3c625d7951c5d84c9b2fd14b123da4be3f3e099378353e101ba3e02f001b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely serve to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/award?keyword=peterbilt+radio+antenna PDF link annotation
    • https://razijidepafex.weebly.com/uploads/1/3/4/8/134891772/1155700.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/6xia2Ah/85340319920.pdfIn PDF document text
    • https://tuloforukidape.weebly.com/uploads/1/3/4/7/134752744/lanitugezuzev.pdfIn PDF document text
    • https://cdn.sqhk.co/toralapiluw/jdhdpjS/teamviewer_control_remote_computer_greyed_out.pdfIn PDF document text
    • https://tenemetit.weebly.com/uploads/1/3/2/6/132696414/nuzibebelokilanipore.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/dWiajeM/82301729441.pdfIn PDF document text
    • https://cdn.sqhk.co/lunabati/hhaU5RO/vampires_1998_full_movie.pdfIn PDF document text
    • https://jurozujuzofu.weebly.com/uploads/1/3/4/8/134875655/1957169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500429/normal_5ff3adcee6619.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/potirodagoleputisifasiizg1n.pdfIn PDF document text
    • https://cdn.sqhk.co/tusadopovet/Uedhgv1/cash_for_gift_cards_machine_near_me.pdfIn PDF document text
    • http://iceteas.space/xolujajujomivizuzeiqzv9.pdfIn PDF document text
    • http://esclick.pro/65119660373vib6r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezewezelatemak.epizy.com/4522713417.pdfIn PDF document text
    • http://ribitotuv.epizy.com/vurikokexipuv.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48A 4780 bytes
SHA-256: a9d4702221c42e10008d62654e206331b171a3eb7f409937670291a2d501bdc0
font_01_sfnt_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 10860 bytes
SHA-256: 7aa4bb58bb65864f92a2d9af084ea609ed634b79914271d9a2d2b9c43dfbda99

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